Krypt Towers polished aluminum wakeboard tower bimini clamps. This clamp in size will fit tubing sizes: 2 3/4", 2 7/8", 3" These tower clamps are made of solid polished 6061 aluminum and come with the allen screw. Our polished aluminum wakeboard tower bimini clamps are great for replacing old clamps, fitting existing tower accessories on a new wakeboard tower tubing size, or completing a Do It Yourself tower accessory project. This clamp in size large will fit tubing sizes: 2 3/4", 2 7/8", 3"